from tkinter import *
root = Tk()
root.title('登录界面')
root.geometry('400x300')

Label(root, text="First").grid(row=0)
Label(root, text="Second").grid(row=1)
entry_one = Entry(root)
entry_two = Entry(root)
button = Button(root, text='计算', height=2)
button.grid(row=0, column=2, rowspan=2)
entry_one.grid(row=0, column=1)
entry_two.grid(row=1, column=1)
root.mainloop()
